Understanding Multiplication Techniques

This video tutorial explains how to multiply three-digit numbers by 111 using mental math. It provides two examples: 354 x 111 and 684 x 111, detailing each step of the process. The tutorial concludes with a recap and offers practice problems for viewers to try on their own.

What is the first step in multiplying a three-digit number by 111?

• Write the tens digit.

• Write the ones digit.

• Write the sum of all digits.

• Write the hundreds digit.

In the example of 354 x 111, what is the sum of the tens and ones digits?

• 10

• 11

• 9

• 7

When adding in groups of three, what do you do if there are no more groups left?

• Add the hundreds digit.

• Add the two leftmost digits.

• Add the ones digit again.

• Add the tens digit.

What is the result of 354 x 111?

• 39,294

• 39,204

• 39,294

• 39,204

What is the purpose of carrying over a digit in this multiplication method?

• To simplify the calculation.

• To ensure correct addition in the next step.

• To avoid errors in subtraction.

• To adjust the hundreds digit.

In the recap, what is emphasized as the final step after running out of groups of three?

• Write the ones digit.

• Write the sum of all digits.

• Write the carried digit.

• Write the leftmost digit.

In the second example, what is the sum of the ones and tens digits of 684?

• 14

• 12

• 16

• 10

What is the result of 684 x 111?

• 75,249

• 75,294

• 75,924

• 75,942

What is the first digit written in the multiplication of 684 by 111?

• 4

• 1

• 6

• 8

What is the sum of the two leftmost digits in the second example?

• 16

• 12

• 15

• 14